Spektrum SPMAR12120 User Manual

Page 10

Installing the Batteries

Using the given guidelines select the battery system that best fits your application

and install the battery(s)/regulator(s) in your aircraft. Connect the battery to the

PowerSafe. Spektrum batteries are pre-wired with an EC3 connector and plug

directly in. If using another brand of battery it will be necessary to solder EC3

connectors (two are included with the AR12120) to the battery leads. If using a

regulator, install it per the guidelines included with the regulator.
Mounting the Remote Receivers

Antenna Polarization

For optimum RF link performance, it’s important that the remote antennas be

mounted in an orientation that allows for the best possible signal reception when

the aircraft is at all possible attitudes and positions. This is known as antenna

polarization. This allows the greatest exposed visual cross-section of the antennas

from all aircraft orientations. If three antennas are used, it is recommended that

one antenna be mounted vertically, one horizontally in-line with the fuselage and

one horizontally perpendicular to the fuselage (see illustrations on pages 11-12).

This covers the X,Y and Z axis offering superb cross-section visibility in all aircraft

orientations. An optional fourth antenna can be added at an intermediate angle

offering even greater RF link security and system redundancy.
Locating the Remote Receivers

While Spektrum 2.4GHz systems are far more resistant to interference caused from

internal RF generating sources, the remote receivers should be mounted as far

away as practical (typically 4” or greater if possible) from the following:

• Ignition systems

• Ignition batteries

• Ignition switches

• Engines

• ECU pumps

• Electric motors

• Receiver batteries

• Fuel tanks

• Metal bypass tubes • High-temperature components like exhaust systems

• High-vibration areas • Any significant metallic conductive components

The remote antennas should be mounted a minimum of at least 2” apart from

each other as greater antenna separation gives improved path diversity (RF link

performance) in critical environments. In large aircraft where space is not an issue,

it is highly recommended that the antennas be mounted throughout the aircraft

as illustrated. Spektrum offers remote receiver extensions ranging from 6” to 36”

allowing the receivers to be mounted in the most optimum locations throughout

the aircraft.
Using double-sided foam tape and tie wraps, mount a minimum of three and up to

four remote receivers in your aircraft as per the illustrations and plug them into the

receiver ports.
The following are illustrations of typically recommended installations. Note the

remote receiver orientation.